half cystine

half cys·tine

refers to one half of a cystine molecule or of a cystinyl residue in a protein or peptide.
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16) The dosage for cysteamine treatment is 50-90 mg of free base/kg every 6 hours to maintain leukocyte cystine levels to less than 1nmol of half cystine per mg of protein when measured five hours after a dose.